21757553433 has 48 divisors (see below), whose sum is σ = 39216767616. Its totient is φ = 11292721920.

The previous prime is 21757553423. The next prime is 21757553471. The reversal of 21757553433 is 33435575712.

21757553433 is a `hidden beast` number, since 2 + 1 + 7 + 57 + 553 + 43 + 3 = 666.

It is not a de Polignac number, because 21757553433 - 2¹³ = 21757545241 is a prime.

It is a super-2 number, since 2×21757553433² (a number of 21 digits) contains 22 as substring.

It is a hoax number, since the sum of its digits (45) coincides with the sum of the digits of its distinct prime factors.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (21757553413) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 813591 + ... + 839907.

It is an arithmetic number, because the mean of its divisors is an integer number (817015992).

Almost surely, 2^21757553433 is an apocalyptic number.

It is an amenable number.

21757553433 is a deficient number, since it is larger than the sum of its proper divisors (17459214183).

21757553433 is a wasteful number, since it uses less digits than its factorization.

21757553433 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27534 (or 27531 counting only the distinct ones).

The product of its digits is 1323000, while the sum is 45.

The spelling of 21757553433 in words is "twenty-one billion, seven hundred fifty-seven million, five hundred fifty-three thousand, four hundred thirty-three".